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• Decode .wav file and write it into another file using ffmpeg

  16 février 2017, par deshu

  How to decode a .wav file and write it into another file using ffmpeg ?

  I got decoded data by this piece of code :

  -(void)audioDecode:(const char *)outfilename inFileName:(const char *)filename
  
  
  
  {
  
  
  
  const char* input_filename=filename;
  
  
  
      //avcodec_register_all();
  
      av_register_all();
  
      avcodec_register_all();
  
     // av_register_all();
  
      //av_ini
  
  
  
  //    AVFormatContext* container=avformat_alloc_context();
  
  //    if(avformat_open_input(&container,filename,NULL,NULL)<0){
  
  //        NSLog(@"Could not open file");
  
  //    }
  
  
  
      AVCodec *codec;
  
      AVCodecContext *c= NULL;
  
      int len;
  
      FILE *f, *outfile;
  
      uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
  
      AVPacket avpkt;
  
      AVFrame *decoded_frame = NULL;
  
  
  
      av_init_packet(&avpkt);
  
  
  
      printf("Decode audio file %s to %s\n", filename, outfilename);
  
      avcodec_register_all();
  
  
  
      AVFrame* frame = av_frame_alloc();
  
      if (!frame)
  
      {
  
          fprintf(stderr, "Could not allocate audio frame\n");
  
                          exit(1);
  
      }
  
  
  
      AVFormatContext* formatContext = NULL;
  
      /* Opening the file, and check if it has opened */
  
      if (avformat_open_input(&formatContext, filename, NULL, NULL) != 0)
  
      {
  
          av_frame_free(&frame);
  
          NSLog(@"Could not open file");
  
      }
  
  
  
      if (avformat_find_stream_info(formatContext, NULL) < 0)
  
      {
  
          av_frame_free(&frame);
  
          avformat_close_input(&formatContext);
  
  
  
          NSLog(@"Error finding the stream info");
  
      }
  
  
  
          outfile = fopen(outfilename, "wb");
  
          if (!outfile) {
  
              av_free(c);
  
              exit(1);
  
          }
  
  
  
      /* Find the audio Stream, if no audio stream are found, clean and exit */
  
      AVCodec* cdc = NULL;
  
      int streamIndex = av_find_best_stream(formatContext, AVMEDIA_TYPE_AUDIO, -1, -1, &cdc, 0);
  
      if (streamIndex < 0)
  
      {
  
          av_frame_free(&frame);
  
          avformat_close_input(&formatContext);
  
          NSLog(@"Could not find any audio stream in the file");
  
          exit(1);
  
      }
  
  
  
      /* Open the audio stream to read data  in audioStream */
  
      AVStream* audioStream = formatContext->streams[streamIndex];
  
  
  
      /* Initialize the codec context */
  
      AVCodecContext* codecContext = audioStream->codec;
  
      codecContext->codec = cdc;
  
      /* Open the codec, and verify if it has opened */
  
      if (avcodec_open2(codecContext, codecContext->codec, NULL) != 0)
  
      {
  
          av_frame_free(&frame);
  
          avformat_close_input(&formatContext);
  
          NSLog(@"Couldn't open the context with the decoder");
  
          exit(1);
  
      }
  
  
  
      /* Initialize buffer to store compressed packets */
  
      AVPacket readingPacket;
  
      av_init_packet(&readingPacket);
  
      int lenght = 1;
  
      long long int chunk = ((formatContext->bit_rate)*lenght/8);
  
      int j=0;
  
      int count = 0;
  
      //audioChunk output;
  
  
  
  
  
      while(av_read_frame(formatContext, &readingPacket)==0){
  
          //if((count+readingPacket.size)>start){
  
              if(readingPacket.stream_index == audioStream->index){
  
  
  
                  AVPacket decodingPacket = readingPacket;
  
  
  
                  // Audio packets can have multiple audio frames in a single packet
  
                  while (decodingPacket.size > 0){
  
                      // Try to decode the packet into a frame
  
                      // Some frames rely on multiple packets, so we have to make sure the frame is finished before
  
                      // we can use it
  
                      int gotFrame = 0;
  
                      int result = avcodec_decode_audio4(codecContext, frame, &gotFrame, &decodingPacket);
  
  
  
                      count += result;
  
  
  
                      if (result >= 0 && gotFrame)
  
                      {
  
                          decodingPacket.size -= result;
  
                          decodingPacket.data += result;
  
                          int a;
  
  
  
                          for(int i=0;idata[0], 1, decodingPacket.size, outfile);
  
  //                            *(output.data+j)=frame->data[0][i];
  
  //
  
                              j++;
  
                              if(j>=chunk) break;
  
                          }
  
  
  
                          // We now have a fully decoded audio frame
  
                      }
  
                      else
  
                      {
  
                          decodingPacket.size = 0;
  
                          decodingPacket.data = NULL;
  
                      }
  
                     // if(j>=chunk) break;
  
                  }
  
              }
  
  //        }else count+=readingPacket.size;
  
  //        
  
  //        // To prevent memory leak, must free packet.
  
  //        av_free_packet(&readingPacket);
  
  //        if(j>=chunk) break;
  
      }
  
      fclose(outfile);

  But the file is created with zero bytes. I don’t know what’s wrong with this code. And I got one more error : "Format adp detected only with low score of 25, misdetection possible !"

• Error importing VideoFileClip from moviepy : AttributeError : 'PermissionError' object has no attribute 'message'

  11 mars 2017, par Tahlil

  I’m using jupyter notebook. I have also tried from anaconda console as well.

  Tried importing with both the ways shown below

  from moviepy.editor import VideoFileClip
  
  
  
  from moviepy.video.io.VideoFileClip import VideoFileClip

  Both of them gave me same error. Full trace is below

  AttributeError                            Traceback (most recent call last)
  
   in <module>()
  
        6 import glob
  
        7 import math
  
  ----> 8 from moviepy.editor import VideoFileClip
  
        9 from moviepy.video.io.VideoFileClip import VideoFileClip
  
  
  
  C:\Program Files\Anaconda3\lib\site-packages\moviepy\editor.py in <module>()
  
       20 # Clips
  
       21 
  
  ---> 22 from .video.io.VideoFileClip import VideoFileClip
  
       23 from .video.io.ImageSequenceClip import ImageSequenceClip
  
       24 from .video.io.downloader import download_webfile
  
  
  
  C:\Program Files\Anaconda3\lib\site-packages\moviepy\video\io\VideoFileClip.py in <module>()
  
        1 import os
  
        2 
  
  ----> 3 from moviepy.video.VideoClip import VideoClip
  
        4 from moviepy.audio.io.AudioFileClip import AudioFileClip
  
        5 from moviepy.Clip import Clip
  
  
  
  C:\Program Files\Anaconda3\lib\site-packages\moviepy\video\VideoClip.py in <module>()
  
       18 
  
       19 import moviepy.audio.io as aio
  
  ---> 20 from .io.ffmpeg_writer import ffmpeg_write_image, ffmpeg_write_video
  
       21 from .io.ffmpeg_tools import ffmpeg_merge_video_audio
  
       22 from .io.gif_writers import (write_gif,
  
  
  
  C:\Program Files\Anaconda3\lib\site-packages\moviepy\video\io\ffmpeg_writer.py in <module>()
  
       13     DEVNULL = open(os.devnull, 'wb')
  
       14 
  
  ---> 15 from moviepy.config import get_setting
  
       16 from moviepy.tools import verbose_print
  
       17 
  
  
  
  C:\Program Files\Anaconda3\lib\site-packages\moviepy\config.py in <module>()
  
       49     success, err = try_cmd([FFMPEG_BINARY])
  
       50     if not success:
  
  ---> 51         raise IOError(err.message +
  
       52                  "The path specified for the ffmpeg binary might be wrong")
  
       53 
  
  
  
  AttributeError: 'PermissionError' object has no attribute 'message'
  
  </module></module></module></module></module></module>

  Python version info

  Python 3.5.2 |Anaconda custom (64-bit)| (default, Jul  5 2016, 11:41:13) [MSC v.1900 64 bit (AMD64)] on win32
  
  Type "help", "copyright", "credits" or "license" for more information.

  Running ffmpeg -version in a console gives me

  ffmpeg version N-83507-g8fa18e0 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 5.4.0 (GCC)
  
  configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
  libavutil      55. 47.100 / 55. 47.100
  
  libavcodec     57. 80.100 / 57. 80.100
  
  libavformat    57. 66.102 / 57. 66.102
  
  libavdevice    57.  2.100 / 57.  2.100
  
  libavfilter     6. 73.100 /  6. 73.100
  
  libswscale      4.  3.101 /  4.  3.101
  
  libswresample   2.  4.100 /  2.  4.100
  
  libpostproc    54.  2.100 / 54.  2.100

  I’m running 64 bit version of Windows 10.

  I can’t find any solution anywhere and its driving me crazy ! Seems like its not finding the ffmpeg binary but I have put it in C :\ffmpeg\bin and added this to path environment variable. Followed the instruction from here.

• Official Piwik Training in Berlin – 2014, June 6th

  6 mai 2014, par Piwik Core Team — Community

  This event will focus on providing training to users of the Piwik analytics platform. The training will provide attendees with the necessary skills and knowledge that they will need to be able to take their website to the next level with Piwik.

  Language : English

  Register to Piwik Training now.

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  If you have just started using Piwik and are finding it a bit overwhelming, this training event will benefit you immensely. You will be able to learn all the necessary skills that will allow you move forward with Piwik.

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  Advanced users will be able to gain more knowledge about the complex features and functions that Piwik incorporates, allowing you to customise different areas of the platform and learn about advanced topics.

  How can you benefit from this training event ?

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  Everyone, from ecommerce businesses to government organisations can benefit from this training event and learn the essential skills and gain the relevant knowledge to meet their goals and requirements.

  Some of the skills that you will learn during the training include :

  • How to install and get started with the Piwik platform
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  • Advance exercises – Piwik settings, tweaking and basic diagnostics

  What equipment do I need in order to participate in the event ?

  You will need a computer that is able to connect to a Wifi network

  Are the tickets transferable ?

  Yes, the tickets are transferable.

  What is the refund policy on the tickets ?

  You are entitled to a refund up to 1 week before the commencement of the training.

  Training details

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  Contact us : contact@piwik.pro

  Registrations

  Register to Piwik Training now !